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3MP

Three-inch cathode-ray tube for oscilloscope and instrument display service, using electrostatic focusing and electrostatic deflection. Its specified screen designation identifies the phosphor variant within this compact oscillographic family.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B12A
Base pins: -
Nominal heater: 6.3 V / 600 mA

Description

Sylvania 3MP direct-view oscilloscope CRT with electrostatic focus/deflection; P1 green, medium persistence. Published maximum ratings, capacitances, and typical operating conditions were extracted from the supplied datasheet.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B12A
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Cathode Ray

X-ray radiationInterelectrode capacitances

Max plate voltage: 2750 V

Published CRT maximum ratings, capacitances, and operating conditions extracted from supplied Sylvania datasheet.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

Heater Voltage
6.3 V
Heater Current
600 mA
FocusingMethod
Electrostatic
DeflectionMethod
Electrostatic
Phosphor
P1 green, medium persistence
MinimumUsefulScreen
2.75 in
Cathode To All Capacitance
2.2 pF
GridToAllCapacitance
10.3 pF
BetweenDeflectionPlates1_2Capacitance
1.3 pF
BetweenDeflectionPlates3_4Capacitance
1.2 pF
RecommendedAnode2VoltageMinimum
1000 V

Other

Anode2VoltageMaximum
2750 V
Anode1FocusVoltageMaximum
1100 V
GridNegativeBiasMagnitudeMaximum
200 V
GridPositivePeakVoltageMaximum
2 V
PeakHeaterCathodeVoltageNegative
140 V
PeakVoltageAnode2ToDeflectionPlate
550 V
Anode2Voltage
2000 V
Anode1VoltageForFocus
400-700 V
GridVoltageForCutoff
0 to -126 V
DeflectionFactorPlates1_2
230-290 V/in
DeflectionFactorPlates3_4
220-280 V/in
GridCircuitResistanceMaximum
1.5 Mohm
DeflectionCircuitResistanceMaximum
5 Mohm